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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
The Target Muscle. The primary muscle recruited in the shoulder press is the anterior deltoid, which is the front section of your shoulder muscle. The anterior deltoid originates at your clavicle and then runs down the front of your shoulder and inserts at the top of your humerus, or upper arm bone.